Block · one region of the page, as the scanner read it. It may hold a whole story, part of one, several, or an advertisement; stitching blocks into articles is the next step. Text is supplied OCR.
Page 3 · column 4 of 5 · from the scan, no model involved

rent.
Copies of the report, “Detailed Characteristics, 1970 Census of Housing, Virginia” HC (1)-B48 are available for $2.75 each from the Superintendent of Documents, U.S. Government Printing Office, Washington, D.C. 20402, or from U.S. Department of Commerce field offices located in major cities. C
95.5%